Thanks for the information. Tax's page is a great read. Xibing -----Original Message----- From: The Support Vector Machine discussion list [mailto:[log in to unmask]] On Behalf Of Yun Xu Sent: Friday, January 14, 2005 6:10 AM To: [log in to unmask] Subject: Re: one class SVM There are two versions of one-class SVM. One algorithm is to find a close boundary supported by SVs that cover most target samples, developped by D. Tax; another is try to separate target samples from origin as well as possible, developped by B. Schölkopf. You may find more information at David Tax's homepage at http://www-ict.ewi.tudelft.nl/~davidt/ Be sure to read his excellent Ph.D thesis. Hope it helps Yun